[watlhmoH] (v.) is given as "smelt", as in ore, but there should be a comment or new word to the effect that it is NOT the fish. ("
Any small anadromous fish of the family Osmeridae, found in the Atlantic and Pacific Oceans and in lakes in North America and northern part of Europe.")
Aside from the "(v)" annotation, it's also very clearly just {watlh} "be pure" with the suffix {-moH} turning it into "purify", applied to ore.
yIDoghQo'. wot 'oHbe'ba' bIQDep Seghvam'e'.
If you find an example of the fish's name being used as a verb, I might be convinced that you have a valid point.
This is English we're talking about, and I can just badger, buffalo, dog, bug, flounder, or smelt nouns (fish or otherwise) into verbs as I please.
('ach tlhIngan Hol DIp vIwotlaHbe'ba'.)
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De'vID